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Li Q.,Yankuang Xinlu Construction and Development Ltd Company | Zhang J.,Yankuang Xinlu Construction and Development Ltd Company | Yue P.,Yankuang Xinlu Construction and Development Ltd Company
Modern Tunnelling Technology | Year: 2013

Based on the engineering practices of the connecting passages of the Kunming North Railway Station Metro Project, the key and difficult points in organization and construction procedures for freezing holes are summarized, and the construction procedures and key technologies for horizontal freezing holes in gravel strata are introduced. The technologies for qualified drilling construction and drill hole inclinometry are presented after an analysis of the cause of drilling deviation of freezing holes. Simultaneous grouting for filling some local caves of the connecting passage should be intensive during the construction of the freezing holes, improving the safety of both the connecting passage and the surface buildings and preventing caves from collapsing. Source

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